WO1998011350A1 - Miniature peristaltic pump - Google Patents

Miniature peristaltic pump Download PDF

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Publication number
WO1998011350A1
WO1998011350A1 PCT/CH1997/000329 CH9700329W WO9811350A1 WO 1998011350 A1 WO1998011350 A1 WO 1998011350A1 CH 9700329 W CH9700329 W CH 9700329W WO 9811350 A1 WO9811350 A1 WO 9811350A1
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WO
WIPO (PCT)
Prior art keywords
rotor
pipe
module
miniature
pump
Prior art date
Application number
PCT/CH1997/000329
Other languages
French (fr)
Inventor
Claude Ray
Christian Taillard
Original Assignee
Conseilray S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Conseilray S.A. filed Critical Conseilray S.A.
Priority to DE69709665T priority Critical patent/DE69709665T2/en
Priority to EP97937397A priority patent/EP0927307B1/en
Priority to US09/254,580 priority patent/US6203296B1/en
Publication of WO1998011350A1 publication Critical patent/WO1998011350A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14212—Pumping with an aspiration and an expulsion action
    • A61M5/14232—Roller pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
    • F04B43/1276—Means for pushing the rollers against the tubular flexible member

Definitions

  • the present invention relates to peristaltic pumps. It relates, more particularly, to a miniature peristaltic pump for the injection of medicinal solutions.
  • Miniature pumps or micropumps for medical use have been known for several years. Light and of small dimensions, they are worn by the patient in a discreet manner and without discomfort and allow him to administer, by subcutaneous or intravenous route, continuously or according to a determined program, controlled quantities of medicinal solutions, without it is however bedridden and connected to a bulky, expensive and noisy device
  • Such pumps are, most often, of rotary rotary type, the principle of which is to have a deformable plastic pipe connected to a reservoir containing the solution and to crush it locally against a support piece of rounded shape at by means of pressure rollers mounted on a rotor driven by a motor acting by means of a gear train. The liquid is thus sucked from the reservoir and discharged towards the outlet to be injected into the patient
  • EP 388 787, EP 447 909, EP 521 184 and WO 94/06491 describe miniature peristaltic pumps of this type
  • Patent EP 388 787 shows a support piece having the shape of a hook articulated at one of its ends by a pin and pressed against the pipe using a spring compressed by a screw. support is almost always requested by two rollers, it can not compensate for positional deviations for each roller separately.
  • Patent EP 447 909 shows that the rollers are mounted on their axis with a slight clearance allowing them a certain radial clearance and that individual leaf springs, acting directly on their central part, urge them outwards.
  • cassette pumps are the most common for medical applications. They have two parts, on the one hand, the pump itself, with the motor, the control electronics, the battery and the pump head formed by the rotor and pressure rollers and, on the other hand, the cassette which snaps onto the pump and includes the pipe and the support piece
  • the reservoir is either integrated in the cassette when it is small, or freely placed at the outside when large
  • the cassette comprises, definitively assembled, the pipe, the support piece and the reservoir.
  • the pumps of the two EP patents can only be used once because, once coupled, the two modules cannot no longer be uncoupled.
  • components are discarded which could still be used as such since they are not worn and have never been in contact with the drug injected into the patient
  • the object of the present invention is to provide an improved miniature pump which is free from the drawbacks of the pumps of the prior art.
  • the miniature penstaltic pump according to the invention comprises - a rotor equipped with at least two rotating rollers,
  • a support piece provided with a rounded portion disposed in a substantially concentric manner with said rotor and against which, in operation, said rollers compress a flexible pipe connected to a reservoir of solution for pushing the latter outwards and
  • each roller has a substantially cylindrical body and an axis on which said body is rotatably mounted, in that the ends of the axes of the rollers take place in oblong openings formed radially in the rotor and in that said compensation means comprise two springs arranged at the level of respective ends of said axes and comprising a central part concentric with the rotor and two curved spring arms, one for each roller, one end of which is connected to said central part and the other end of which rests on the corresponding end of an axis of roller to push it outwards and thus allow it to exert on the pipe a substantially constant compressive force.
  • FIG. 1 is a general exterior view of the pump module
  • - Figure 2 shows the tank module
  • - Figure 3 shows the cassette module
  • Figure 5 is a sectional detail of Figure 4 when the coupling is made
  • - Figure 6 is a general view of the assembled pump
  • - Figure 7 is a top view of the pump module
  • FIG. 8 is a sectional view of the pump module along line VIII-VIII of Figure 7;
  • FIG. 9 is a top view of the rotor of the pump module
  • FIG. 11 is a diagram of the pump control circuit
  • Figure 12 illustrates an alternative embodiment of the tank module.
  • the miniature pump according to the invention consists of three modules, a pump module 100, a tank module 200 and a cassette module 300 which will also be called respectively pump, tank and cassette.
  • the reservoir 200 is removably placed in the cassette 300 which, in turn, detachably couples to the pump 100.
  • the assembled pump has a length of 110 mm, a width of 55 mm and a thickness of 13 mm for a tank capacity of 10 ml.
  • the pump module 100 shown in FIG. 1, comprises a rigid plastic casing 101 the bottom of which extends from one side to form the base of two parallel slides 102 serving for the positioning of the cassette module 300 in the same way as 'A drawer
  • each slide 102 is pierced with an opening 103 in which is formed a flexible tongue 104 forming a push button for the release of the cassette when it must be uncoupled from the pump
  • the housing 101 On its upper face, the housing 101 includes a "START / STOP" button 105 used to control the starting and stopping of the pump, a "BOLUS” button 106 used to trigger the administration of additional doses of solution, an alarm acoustic 107 and an LCD display 108
  • the housing 101 lets appear, between its two slides 102, a rotor 109 carrying three rollers 110 and forming the pump head. A detailed description will be given below at the same time as that of its drive means.
  • the reservoir module 200 is formed of a plastic bag 201 having, in the embodiment shown, a volume of 10 ml and of a flexible plastic pipe 202, one end of which is connected to the pocket and the other of which, intended to be connected to a subcutaneous or intravenous injection needle, is closed by a plug 203
  • the pipe also comprises, in addition, two rigid molded elbow-shaped fittings 204 and 205 used to clip it into the cassette 300, as will appear better later
  • the cassette module 300 shown seen from below in FIG. 3, is made of rigid plastic and has a housing 301 intended to receive the plastic bag 201 it has substantially the same thickness and the same width as the housing 101 and has, on the bottom side , a cover 302 mounted on two hinges 303 and provided, at the other end, with tabs 304 ensuring its closing by clipping in.
  • the housing 301 is extended by a plate 305 which is profiled and dimensioned to take place, like a drawer, between the slides 102 of the housing
  • the plate 305 is pierced, on the bottom side, with a housing 307, in the general shape of a U, dimensioned so as to receive the rotor 109 of the pump module II comprises, for this purpose, a rounded central part 308 of approximately 120 degrees and of which the radius is slightly greater than that of the circle traversed by the external face of the rollers 1 0. It is on this rounded portion 308 that in operation, the three rollers come in turn to crush the flexible pipe 202.
  • An additional rounded clearance 309 is provided around the portion 308 to receive the lower part of the rotor 109, of larger diameter than the circle traversed by the rollers, as will appear later
  • the bottom of the housing 307 which forms the upper wall of the module, is pierced, in the center of the rounded portion 308, with a circular orifice 310 facing the place where the axis of the rotor 109 takes place in order to allow the purge the pump before use, as will be described later
  • This orifice can be closed by a cover 311 sliding in a recess 312 in the upper wall of the module
  • the plate 305 also includes two channels 313 and 314 each formed in the bottom of one of its sides parallel to the latter.
  • the channel 313 connects the housing 301 to the front part of the housing 307. Before opening into the latter, it has a bent portion 315, of larger diameter, formed and dimensioned so as to receive and hold by clipping the rigid connector 204 of the flexible pipe 202.
  • the channel 314 starts from the front part of the housing 307 opposite the place where the other channel 313 arrives and opens out after a bent portion 316, of larger diameter, formed and dimensioned so as to receive and hold by clipping the rigid connection 205 of the pipe 202.
  • FIGS. 4, 5 and 6 show the way in which the three previously described modules couple to form the miniature pump according to the invention
  • the tank module 200 is, first of all, placed in the cassette module 300
  • the plastic bag 201 is introduced into its housing 301 and the flexible pipe 202 positioned in the channels 313 and 314 while ensuring that its two rigid connections 204 and 205 take place and snap into the bent portions 315 and 316 respectively of the tray 305
  • the upper end of the axis of the latter has, for this purpose, an opening of shape 134 appearing in the opening 310 of the cassette and which allows, using an appropriate tool, the rapid rotation of the rotor until drops of the solution to be injected exit from the needle 602 This can then be introduced into the patient, after the pump is started by pressing on the button 105 which controls the rotation of the rotor 109 by means which will be described later in detail
  • the uncoupling of the pump 100 and cassette 300 modules is carried out by pressing the two buttons 104 so as to release the tabs 306 from the openings 103
  • the cassette can then be removed by sliding it outwards before being removed. remove the tank 200 which can be replaced by another, the cassette and the pump can be reused for another treatment
  • FIGS. 7 a 1 1 show the rotor 109, a stepping motor 1 1 1, a gear train 1 12 coupling the motor to the rotor, an electronic control module 1 13 and a stick battery 1 14
  • the rotor 109 shown in detail in Figures 8 and 9, has a circular base 1 15 provided with peripheral teeth 1 16 and mounted in free rotation on a pivot 117 forming part of the bottom of the housing 101
  • This crown has, towards the inside, three flexible arms 120 molded in its mass at 120 ° from one another and forming pawls, the end of which cooperates with the sawtooth path 121 of a wheel 122
  • the wall of the plate 123 has a profile curved towards the interior 124 so as to form a channel for the passage of the flexible tube 202
  • This same wall is also pierced with three U-shaped housings 125 arranged at 120 ° one of the other to receive the three rollers 1 10 for compressing the pipe
  • Each roller 1 10 is formed by an axis 126 and a cylindrical body 127 mounted on the axis around which it can rotate freely The two ends of this axis take place in oblong openings 128 formed radially in the portions of the plate 123 forming the lower and upper planar walls of the housings 125.
  • rollers are held in a vertical position, that is to say with their axis parallel to the axis of the rotor, and subjected to a radial force directed towards the extender by means of two springs 129 arranged on either side of the plate 123
  • Each spring has a rigid central part 130, of substantially triangular shape, fixed to the plate concent ⁇ ment to it by rivets 131 and three flexible bent spring arms 132 whose free ends bear on the respective ends of the axes 126 and push them towards the expander so that the rollers 1 10 exert on the pipe 202 a substantially constant force, fix ée at 120 grams in the example described
  • the relative positioning errors of the rollers and the pipe due to the inevitable manufacturing defects, are thus automatically compensated, which avoids excessive or insufficient compression of the pipe 202
  • the plate 123 is extended axially upwards by a protuberance 133 passing through the central part 130 of the upper spring 129 This protuberance is pierced with the opening of form 134 already mentioned in which can be introduced, through the circular orifice 310 of the cassette, the correspondingly shaped tip of a tool (not shown) allowing the rapid rotation of the plate to purge the pump
  • the rotor 109 is driven in rotation by the stepping motor 111 which is of the conventional bipolar single-phase type and rotates at the speed of 16 revolutions / second at the rate of two steps per revolution.
  • Its core-coil and its stator are fixed on feet formed in the bottom of the case 101 by two screws 137
  • Its rotor 138 pivots between the bottom of the case and a bridge 139 fixed by screws 140 on feet secured to the bottom of the housing.
  • the rotor 138 carries a pinion 141 meshing with a wheel 142 forming the first moving part of the gear train 112.
  • the pinion 143 of this wheel itself meshes with a wheel 144 whose pinion 145 finally meshes with the peripheral toothing 116 of the base 115 of rotor 109 to rotate it at the speed of 0.625 revolutions per minute.
  • the wheels 142 and 144 pivot, like the rotor 138, between the bottom of the housing and the bridge 139. The latter ends, after a bend, by two arms 146, not shown in FIG. 9, the common end of which includes a circular opening in which the protuberance 133 of the rotor 109 is held and pivots.
  • the roller-bearing plate 123 When, in order to purge the pipes, the roller-bearing plate 123 is rotated using a tool of appropriate shape introduced into the opening 134, the base 1 15 and the crown 1 18 become fixed, because they are braked by the retention torque of the motor 1 1 1 and its gear train 1 12 A clutch then operates automatically between the crown 1 18 and the wheel 122 because the rotation of the latter causes the expulsion of the three pawls 120 sawtooth
  • roller carrier 123 can thus be rotated quickly without effect on the gears tram and the motor
  • the electronic control module 113 shown in FIG. 10, is based on a printed circuit board 147 fixed under the upper face of the housing and carrying the buttons 105 and 106, the horn 107 and the LCD display 108.
  • the plate also carries a microprocessor circuit 148 integrating the following main functions: voltage doubler, quartz time base, memory, LCD driver and sound generator.
  • This microprocessor being of a known type, such as the EPSON 62L35, it will not be described in detail. All of these components as well as the battery 114 and the coil of the motor 111 are interconnected according to the simplified diagram of FIG. 11.
  • the microprocessor 148 is programmed, according to means well known to those skilled in the art, so that the assembly operates as follows.
  • the switch 105 When the switch 105 is actuated for the first time, it triggers the operation of the microprocessor 148 which, under the orders of an administration program stored in the memory, applies across the stepping motor 111 motor pulses to the 32 Hz frequency causing it to rotate at a speed of 16 rpm. The roller-bearing rotor 109 is then driven at the speed of 0.625 rpm. Pump operation is interrupted when switch 105 is actuated a second time
  • the solution advances in the pipe at the speed of 41 mm / min.
  • the instantaneous flow rate of the pump is thus 69.54 mm3 / min, or 100 cm3 / day.
  • the microprocessor 148 also makes it possible, in response to the actuation of the button 106, to escape the administration program stored in memory to order the injection of a determined additional quantity of solution (bolus). This procedure is more particularly intended for pain relief treatments.
  • the pump is also provided with means making it possible to actuate the audible alarm 107 and / or the LCD display 108 in the event of a malfunction not respecting the program, stopping, obstruction of the needle, end of life of the battery. These means not being the subject of this patent, they will not be described.
  • FIG. 12 shows an alternative embodiment of the cassette module 300 for treatments requiring the injection of large quantities of solution.
  • the cassette can, of course, be extended to receive a larger tank, but if the volume of this exceeds 20 ml, the size of the pump may make it impractical
  • the cassette module in Figure 12 only comprises the plate 305 described in FIG. 3, the same references being used to designate the same elements.
  • the reservoir module then comprises a large-volume pocket 206, which is not introduced into the cassette but only connected to it by a flexible hose 202 longer identical to that described in FIG. 2.

Abstract

The invention concerns a miniature peristaltic pump comprising a rotor (109) provided with three turning rollers (110), a support piece with a rounded portion arranged substantially concentric to said rotor and against which, when operating said rollers are brought to compress a flexible pipe connected to a reservoir of solution to push it outwards and means for automatically compensating positional deviations between the rollers and said support piece. Each roller (110) comprises a substantially cylindrical body (127) and a spindle (126) on which said body is rotatably mounted. The ends of the roller spindles are located in oblong apertures (128) radially recessed in the rotor. The compensating means comprise two springs (129) arranged at the respective ends of said spindles and comprising a central part (130) concentric to the rotor and three curved spring arms (132), one for each roller, with one end connected to said central part and the other end bearing on the corresponding end of a roller spindle to push it outwards and thus enable it to exert a substantially constant force of pressure. The invention is useful for the subcutaneous or intravenous injection of medicinal solutions.

Description

POMPE PERISTALTIQUE MINIATURE MINIATURE PERISTALTIC PUMP
La présente invention se rapporte aux pompes péristaltiques Elle concerne, plus particulièrement, une pompe péπstaltique miniature pour l'injection de solutions médicamenteusesThe present invention relates to peristaltic pumps. It relates, more particularly, to a miniature peristaltic pump for the injection of medicinal solutions.
Les pompes miniatures ou micropompes à usage médical sont connues depuis plusieures années. Légères et de faibles dimensions, elles sont portées par le patient de façon discrète et sans inconfort et permettent de lui administrer, par voie sous-cutanée ou intraveineuse, en continu ou selon un programme déterminé, des quantités contrôlées de solutions médicamenteuses, sans qu'il soit pour autant alité et relié à un appareil encombrant, coûteux et bruyantMiniature pumps or micropumps for medical use have been known for several years. Light and of small dimensions, they are worn by the patient in a discreet manner and without discomfort and allow him to administer, by subcutaneous or intravenous route, continuously or according to a determined program, controlled quantities of medicinal solutions, without it is however bedridden and connected to a bulky, expensive and noisy device
De telles pompes sont, le plus souvent, de type péπstaltique rotatif dont le principe consiste à disposer d'un tuyau en matière plastique déformable relié à un réservoir contenant la solution et à l'écraser localement contre une pièce d'appui de forme arrondie au moyen de galets presseurs montés sur un rotor entraîné par un moteur agissant par l'intermédiaire d'un train d'engrenages. Le liquide est ainsi aspiré du réservoir et refoulé vers la sortie pour être injecté dans le patientSuch pumps are, most often, of rotary rotary type, the principle of which is to have a deformable plastic pipe connected to a reservoir containing the solution and to crush it locally against a support piece of rounded shape at by means of pressure rollers mounted on a rotor driven by a motor acting by means of a gear train. The liquid is thus sucked from the reservoir and discharged towards the outlet to be injected into the patient
Les brevets EP 388 787, EP 447 909, EP 521 184 et WO 94/06491 décrivent des pompes péristaltiques miniatures de ce typeEP 388 787, EP 447 909, EP 521 184 and WO 94/06491 describe miniature peristaltic pumps of this type
Lors de la conception de telles pompes, il est particulièrement important de veiller à l'optimisation du couplage entre les galets et le tuyau qu'ils viennent tour à tour écraser contre la pièce d'appuiWhen designing such pumps, it is particularly important to ensure the optimization of the coupling between the rollers and the pipe which they in turn crush against the support piece.
Des mesures ont montré que la pression minimale sur un galet de 5 mm de diamètre nécessaire pour faire écouler un liquide dans un tuyau en plastique ayant un diamètre interne de 1 47 mm et un diamètre externe de 1 96 mm est de 95 gr. La force de traction correspondante, exercée par le galet, est de 15 gr La pression sur le galet peut monter jusqu'à 150 gr sans faire augmenter proportionnellement la force de traction qui passe alors seulement de 15 à 20 gr Mais au delà de cette limite, la force de traction augmente très rapidement Elle passe, en effet, à 50 gr pour une pression de 200 gr, après quoi, les mesures deviennent impossibles De telles constatations s'expliquent aisément par le fait qu'une fois le tuyau souple comprimé jusqu'à sa complète obturation, toute augmentation de pression provoque la déformation du matériau plastique et la force de traction correspondante augmente alors en relation avec son module d'élasticitéMeasurements have shown that the minimum pressure on a roller of 5 mm in diameter necessary to make a liquid flow through a plastic pipe having an internal diameter of 1,47 mm and an external diameter of 1,96 mm is 95 gr. The corresponding pulling force, exerted by the roller, is 15 gr The pressure on the roller can go up to 150 gr without increasing proportionally the pulling force which then passes only from 15 to 20 gr But beyond this limit , the pulling force increases very quickly It passes, in fact, to 50 gr for a pressure of 200 gr, after which, the measurements become impossible Such observations are easily explained by the fact that once the flexible hose is compressed until it is completely closed, any increase in pressure causes the plastic material to deform and the corresponding tensile force then increases in relation to its modulus. elasticity
Ainsi, toute vaπation de position du galet par rapport au tuyau au delà de celle qui réalise son obturation sollicite fortement le rotor porte-galets et son moteur d'entraînement, ce qui provoque rapidement son bloquage et donc l'arrêt de la pompe. L'effet est d'autant plus marqué dans les pompes miniatures qui sont équipées de moteurs évidemment moins puissants que les pompes non portables.Thus, any change in position of the roller relative to the pipe beyond that which obtains its closure places a heavy stress on the roller-bearing rotor and its drive motor, which quickly causes it to block and therefore stop the pump. The effect is all the more marked in miniature pumps which are obviously equipped with less powerful motors than non-portable pumps.
A l'inverse, toute vaπation de position du galet en deçà de celle qui réalise son obturation ne permet pas un écoulement suffisant du liquideConversely, any change in position of the roller below that which achieves its closure does not allow sufficient flow of the liquid.
Il est donc très important, pour obtenir une pompe à fonctionnement sûr, que la distance séparant le galet de la pièce d'appui soit parfaitement définie et constante afin d'éviter le bloquage pur et simple ou un débit irrégulier et insuffisant.It is therefore very important, to obtain a pump with safe operation, that the distance separating the roller from the support piece is perfectly defined and constant in order to avoid pure and simple blocking or an irregular and insufficient flow.
Si donc la pièce d'appui et le galet sont fixes, des tolérances de fabrication extrêmement sévères sont nécessaires et augmentent ainsi très sensiblement le prix de revient de la pompe.If therefore the support piece and the roller are fixed, extremely strict manufacturing tolerances are necessary and thus very significantly increase the cost price of the pump.
II est donc préférable d'accepter des tolérances plus légères et de prévoir des moyens permettant de compenser automatiquement tout écart de position entre la pièce d'appui et le galet.It is therefore preferable to accept lighter tolerances and to provide means making it possible to automatically compensate for any difference in position between the support piece and the roller.
Les brevets EP 388 787 et EP 447 909 déjà cités décrivent succintement des arrangements pour résoudre ce problème.The patents EP 388 787 and EP 447 909 already cited briefly describe arrangements for solving this problem.
Le brevet EP 388 787 montre une pièce d'appui présentant la forme d'un crochet articulé à l'une de ses extrémités par une goupille et pressé contre le tuyau à l'aide d'un ressort comprimé par une vis Cette pièce d'appui étant pratiquement toujours sollicitée par deux galets, elle ne peut assurer la compensation des écarts de position pour chaque galet séparément. Le brevet EP 447 909 montre que les galets sont montés sur leur axe avec un léger jeu leur permettant un certain débattement radial et que des ressorts à lame individuels, agissant directement sur leur partie centrale, les sollicitent vers l'extérieur Une telle disposition présente le double inconvénient de compliquer le montage du rotor et de l'amener à glisser sur le tuyau plutôt que de tourner II est aussi indiqué, dans ce document, que les ressorts peuvent être remplacés par une pièce élastique unique, dont aucune descπption n'est cependant fournie et qu'ils peuvent être carrément omis car les galets sont alors déplacés radialement par l'élasticité inhérente du tuyau lui-même Ceci montre que l'importance du problème n'a pas été pleinement perçuePatent EP 388 787 shows a support piece having the shape of a hook articulated at one of its ends by a pin and pressed against the pipe using a spring compressed by a screw. support is almost always requested by two rollers, it can not compensate for positional deviations for each roller separately. Patent EP 447 909 shows that the rollers are mounted on their axis with a slight clearance allowing them a certain radial clearance and that individual leaf springs, acting directly on their central part, urge them outwards. Such an arrangement presents the double disadvantage of complicating the mounting of the rotor and causing it to slide on the pipe rather than turning It is also indicated, in this document, that the springs can be replaced by a single elastic piece, of which no description is however provided and they can be omitted altogether because the rollers are then moved radially by the inherent elasticity of the pipe itself This shows that the importance of the problem has not been fully perceived
Les pompes dites à cassette sont les plus courantes pour les applications médicales Elles comportent deux parties, d'une part, la pompe proprement dite, avec le moteur, l'électronique de pilotage, la pile et la tête de pompe formée du rotor et des galets presseurs et, d'autre part, la cassette qui s'enclipse sur la pompe et comprend le tuyau et la pièce d'appui Le réservoir est soit intégré dans la cassette lorsqu'il est de petites dimensions, soit disposé librement à l'extéπeur lorsqu'il est de grandes dimensionsThe so-called cassette pumps are the most common for medical applications. They have two parts, on the one hand, the pump itself, with the motor, the control electronics, the battery and the pump head formed by the rotor and pressure rollers and, on the other hand, the cassette which snaps onto the pump and includes the pipe and the support piece The reservoir is either integrated in the cassette when it is small, or freely placed at the outside when large
Les pompes des brevets EP 447 909, EP 521 184 et WO 94/06491 sont de ce typeThe pumps of patents EP 447 909, EP 521 184 and WO 94/06491 are of this type
Dans les trois cas, la cassette comporte, assembles de manière définitive, le tuyau, la pièce d'appui et le réservoir Les pompes des deux brevets EP ne sont utilisables qu'une seule fois car, une fois accouplés, les deux modules ne peuvent plus être désaccouplés. A la fin du traitement ou lorsque la cassette est vide, on jette le tout, y compris donc le moteur, la tête de pompe, la pièce d'appui, le train d'engrenages et le circuit qui pourtant sont tous capables de fonctionner à nouveau Quant à la pompe du brevet WO, sa cassette est jettable en même temps que son réservoir Ainsi, dans ces trois pompes, on jette des composants qui pourraient encore être utilisés tels quels puisqu'ils ne sont pas usés et n'ont jamais été en contact avec le médicament injecté dans le maladeIn all three cases, the cassette comprises, definitively assembled, the pipe, the support piece and the reservoir. The pumps of the two EP patents can only be used once because, once coupled, the two modules cannot no longer be uncoupled. At the end of the treatment or when the cassette is empty, everything is discarded, including therefore the motor, the pump head, the support piece, the gear train and the circuit which, however, are all capable of operating at new As for the pump of the WO patent, its cassette is disposable at the same time as its reservoir. Thus, in these three pumps, components are discarded which could still be used as such since they are not worn and have never been in contact with the drug injected into the patient
Les documents US 4 817 057 et EP 120 284 décrivent, par ailleurs, des pompes péristaltiques à cassette de grandes dimensions, c'est à dire non portables Bien que le tuyau puisse être aisément inséré dans - ou enlevé de - la cassette, il est muni d'un embout de raccordement à la tubulure provenant du réservoir et sa portion soumise à l'action peπstaltique est spécialement conçue pour résister a une exposition prolongée à l'effet de compression des galets Une telle construction présente des inconvénients car, non seulement, elle n'interdit pas la réutilisation du tuyau pour administrer des solutions médicamenteuses différentes à des patients différents, mais encore, les opérations d'interconnexion des deux tubes accroissent le risque de pollution du circuit par des bactéπes.The documents US 4,817,057 and EP 120,284 describe, moreover, peristaltic pumps with a large cassette, that is to say not portable. Although the hose can be easily inserted into - or removed from - the cassette, it is fitted with a connection piece to the tubing coming from the tank and its portion subjected to peπstaltic action is specially designed to withstand prolonged exposure to the compression effect of the rollers. Such a construction has drawbacks because, not only does it not prevent the re-use of the hose for administering different medicinal solutions to different patients, but also, the operations of interconnecting the two tubes increase the risk of pollution of the circuit by bacteria.
Un autre problème important qui se pose lors de la conception de telles pompes est celui de la purge des tubulures, c'est à dire de l'évacuation de l'air qu'elles contiennent encore, avant l'introduction de l'aiguille dans le patient La vitesse de rotation du rotor étant très faible, généralement inférieure à 1 tour/minute, cette opération doit, pour ne pas prendre trop de temps, être effectuée en faisant tourner rapidement le rotor par des moyens externes Dans le brevet EP 388 787, il est prévu une roue qui est solidaire du rotor et comporte une série de trous dans lesquels on peut introduire la pointe d'un stylo, par exemple, pour faire tourner la roue rapidement La solution est, certes, intéressante, mais aucune disposition n'est prévue pour éviter que cette opération n'endommage le train d'engrenagesAnother important problem which arises during the design of such pumps is that of the bleeding of the pipes, that is to say the evacuation of the air which they still contain, before the introduction of the needle into the patient The speed of rotation of the rotor being very low, generally less than 1 revolution / minute, this operation must, in order not to take too long, be carried out by rapidly rotating the rotor by external means In patent EP 388,787 , there is provided a wheel which is integral with the rotor and has a series of holes in which one can introduce the tip of a pen, for example, to turn the wheel quickly. The solution is, admittedly, interesting, but no provision n is provided to prevent this operation from damaging the gear train
La présente invention a pour but de fournir une pompe péπstaltique miniature améliorée qui est exempte des inconvénients des pompes de l'art antérieurThe object of the present invention is to provide an improved miniature pump which is free from the drawbacks of the pumps of the prior art.
La pompe pénstaltique miniature selon l'invention comporte - un rotor équipé d'au moins deux galets tournants,The miniature penstaltic pump according to the invention comprises - a rotor equipped with at least two rotating rollers,
- des moyens d'entraînement dudit rotor,means for driving said rotor,
- des moyens de commande desdits moyens d'entraînement,means for controlling said drive means,
- une pièce d'appui munie d'une portion arrondie disposée de manière sensiblement concentnque audit rotor et contre laquelle, en fonctionnement, lesdit galets vient comprimer un tuyau souple relié à un réservoir de solution pour pousser celle-ci vers l'extérieur eta support piece provided with a rounded portion disposed in a substantially concentric manner with said rotor and against which, in operation, said rollers compress a flexible pipe connected to a reservoir of solution for pushing the latter outwards and
- des moyens de compensation automatique des écarts de position entre les galets et ladite pièce d'appuimeans for automatically compensating for position differences between the rollers and said support piece
Cette pompe est principalement caractérisée en ce que chaque galet comporte un corps sensiblement cylindrique et un axe sur lequel ledit corps est monte rotatif, en ce que les extrémités des axes des galets prennent place dans des ouvertures oblongues ménagées radialement dans le rotor et en ce que lesdits moyens de compensation comportent deux ressorts disposés au niveau des extrémités respectives desdits axes et comprenant une partie centrale concentrique au rotor et deux bras ressorts recourbés, un pour chaque galet, dont une extrémité est reliée à ladite partie centrale et dont l'autre extrémité prend appui sur l'extrémité correspondante d'un axe de galet pour le pousser vers l'extérieur et lui permettre ainsi d'exerœr sur le tuyau une force de compression sensiblement constante.This pump is mainly characterized in that each roller has a substantially cylindrical body and an axis on which said body is rotatably mounted, in that the ends of the axes of the rollers take place in oblong openings formed radially in the rotor and in that said compensation means comprise two springs arranged at the level of respective ends of said axes and comprising a central part concentric with the rotor and two curved spring arms, one for each roller, one end of which is connected to said central part and the other end of which rests on the corresponding end of an axis of roller to push it outwards and thus allow it to exert on the pipe a substantially constant compressive force.
D'autres caractéristiques de la présente invention ressortiront de la description qui va suivre, faite en regard des dessins annexés et donnant, à titre explicatif mais nullement limitatif, une forme préférée de réalisation de cette pompe. Sur ces dessins:Other characteristics of the present invention will emerge from the description which follows, given with reference to the appended drawings and giving, by way of explanation but in no way limiting, a preferred embodiment of this pump. In these drawings:
- la figure 1 est vue générale extérieure du module pompe;- Figure 1 is a general exterior view of the pump module;
- la figure 2 représente le module réservoir; - la figure 3 représente le module cassette;- Figure 2 shows the tank module; - Figure 3 shows the cassette module;
- la figure 4 montre la façon dont les trois modules sont accouplés;- Figure 4 shows how the three modules are coupled;
- la figure 5 est un détail en coupe de la figure 4 lorsque l'accouplement est réalisé;- Figure 5 is a sectional detail of Figure 4 when the coupling is made;
- la figure 6 est une vue générale de la pompe assemblée; - la figure 7 est une vue de dessus du module pompe;- Figure 6 is a general view of the assembled pump; - Figure 7 is a top view of the pump module;
- la figure 8 est une vue en coupe du module pompe selon la ligne VIII- VIII de la figure 7;- Figure 8 is a sectional view of the pump module along line VIII-VIII of Figure 7;
- la figure 9 est une vue de dessus du rotor du module pompe;- Figure 9 is a top view of the rotor of the pump module;
- la figure 10 montre le module électronique de commande de la pompe; - la figure 11 est un schéma du circuit de commande de la pompe,- Figure 10 shows the electronic pump control module; FIG. 11 is a diagram of the pump control circuit,
- enfin, la figure 12 illustre une variante de réalisation du module réservoir.- Finally, Figure 12 illustrates an alternative embodiment of the tank module.
Ainsi que le montrent les figures 1 à 5, la pompe miniature selon l'invention est constituée de trois modules, un module pompe 100, un module réservoir 200 et un module cassette 300 qui seront aussi appelés respectivement pompe, réservoir et cassette. Le réservoir 200 se plaœ de façon amovible dans la cassette 300 qui, à son tour, s'accouple de façon amovible à la pompe 100.As shown in Figures 1 to 5, the miniature pump according to the invention consists of three modules, a pump module 100, a tank module 200 and a cassette module 300 which will also be called respectively pump, tank and cassette. The reservoir 200 is removably placed in the cassette 300 which, in turn, detachably couples to the pump 100.
Pour fixer les idées et à simple titre d'exemple, la pompe assemblée a une longueur de 110 mm, une largeur de 55 mm et une épaisseur de 13 mm pour une capacité de réservoir de 10 ml. Le module pompe 100, représenté sur la figure 1 , comporte un boîtier en plastique rigide 101 dont le fond se prolonge d'un côte pour former la base de deux coulisses parallèles 102 servant à la mise en place du module cassette 300 à la manière d'un tiroir Ainsi qu'il apparaît mieux sur la figure 5, chaque coulisse 102 est percée d'une ouverture 103 dans laquelle est ménagée une languette souple 104 formant un bouton poussoir destiné au dégagement de la cassette lorsqu'elle doit être désaccouplée de la pompeTo fix the ideas and simply as an example, the assembled pump has a length of 110 mm, a width of 55 mm and a thickness of 13 mm for a tank capacity of 10 ml. The pump module 100, shown in FIG. 1, comprises a rigid plastic casing 101 the bottom of which extends from one side to form the base of two parallel slides 102 serving for the positioning of the cassette module 300 in the same way as 'A drawer As is best seen in Figure 5, each slide 102 is pierced with an opening 103 in which is formed a flexible tongue 104 forming a push button for the release of the cassette when it must be uncoupled from the pump
Sur sa face supéπeure, le boîtier 101 comporte un bouton "START/STOP" 105 servant à commander le démarrage et l'arrêt de la pompe, un bouton "BOLUS" 106 servant à déclencher l'administration de doses additionnelles de solution, un avertisseur acoustique 107 et un affichage LCD 108On its upper face, the housing 101 includes a "START / STOP" button 105 used to control the starting and stopping of the pump, a "BOLUS" button 106 used to trigger the administration of additional doses of solution, an alarm acoustic 107 and an LCD display 108
Le boîtier 101 laisse apparaître, entre ses deux coulisses 102, un rotor 109 portant trois galets 110 et formant la tête de la pompe Une description détaillée en sera donnée plus loin en même temps que celle de ses moyens d'entraînementThe housing 101 lets appear, between its two slides 102, a rotor 109 carrying three rollers 110 and forming the pump head. A detailed description will be given below at the same time as that of its drive means.
Le module réservoir 200, représenté sur la figure 2, est formé d'une poche en plastique 201 ayant, dans le mode de réalisation représente, un volume de 10 ml et d'un tuyau en plastique souple 202 dont une extrémité est reliée à la poche et dont l'autre, destinée à être connectée à une aiguille d'injection sous-cutanee ou intraveineuse, est obturée par un bouchon 203 Le tuyau comporte, en outre, en surépaisseur, deux raccords moulés rigides en forme de coude 204 et 205 servant à son enclipsage dans la cassette 300, ainsi qu'il apparaîtra mieux plus tardThe reservoir module 200, shown in FIG. 2, is formed of a plastic bag 201 having, in the embodiment shown, a volume of 10 ml and of a flexible plastic pipe 202, one end of which is connected to the pocket and the other of which, intended to be connected to a subcutaneous or intravenous injection needle, is closed by a plug 203 The pipe also comprises, in addition, two rigid molded elbow-shaped fittings 204 and 205 used to clip it into the cassette 300, as will appear better later
Le module cassette 300, représenté vu de dessous sur la figure 3, est réalise en plastique rigide et comporte un logement 301 destiné à recevoir la poche plastique 201 il a sensiblement la même épaisseur et la même largeur que le boîtier 101 et possède, côté fond, un couvercle 302 monté sur deux charnières 303 et muni, à l'autre extrémité, de languettes 304 assurant sa fermeture par enclipsage Le logement 301 se prolonge par un plateau 305 profilé et dimensionné pour prendre place, comme un tiroir, entre les coulisses 102 du boîtier Deux languettes 306, ménagées sur ses côtés, y permettent son enclipsage par arrimage de leur extrémité dans les ouvertures 103, ainsi que le montre également la figure 5 Le plateau 305 est percé, côté fond, d'un logement 307, en forme générale de U, dimensionné de manière à recevoir le rotor 109 du module pompe II comporte, à cet effet, une partie centrale arrondie 308 de 120 degrés environ et dont le rayon est légèrement supérieur à celui du cercle que parcourt la face externe des galets 1 0. C'est sur cette portion arrondie 308 qu'en fonctionnement, les trois galets viennent tour à tour écraser le tuyau flexible 202. Un dégagement supplémentaire arrondi 309 est prévu autour de la portion 308 pour recevoir la partie inférieure du rotor 109, de plus grand diamètre que le cercle parcouru par les galets, comme il apparaîtra plus loinThe cassette module 300, shown seen from below in FIG. 3, is made of rigid plastic and has a housing 301 intended to receive the plastic bag 201 it has substantially the same thickness and the same width as the housing 101 and has, on the bottom side , a cover 302 mounted on two hinges 303 and provided, at the other end, with tabs 304 ensuring its closing by clipping in. The housing 301 is extended by a plate 305 which is profiled and dimensioned to take place, like a drawer, between the slides 102 of the housing Two tabs 306, arranged on its sides, allow it to be clipped there by securing their end in the openings 103, as also shown in FIG. 5 The plate 305 is pierced, on the bottom side, with a housing 307, in the general shape of a U, dimensioned so as to receive the rotor 109 of the pump module II comprises, for this purpose, a rounded central part 308 of approximately 120 degrees and of which the radius is slightly greater than that of the circle traversed by the external face of the rollers 1 0. It is on this rounded portion 308 that in operation, the three rollers come in turn to crush the flexible pipe 202. An additional rounded clearance 309 is provided around the portion 308 to receive the lower part of the rotor 109, of larger diameter than the circle traversed by the rollers, as will appear later
Le fond du logement 307, qui forme la paroi supérieure du module, est percé, au centre de la portion arrondie 308, d'un orifice circulaire 310 au regard de l'endroit où prend place l'axe du rotor 109 afin de permettre la purge de la pompe avant usage, comme il sera décrit plus loin Cet orifice est obturable par un couvercle 311 coulissant dans un évidement 312 de la paroi supérieure du moduleThe bottom of the housing 307, which forms the upper wall of the module, is pierced, in the center of the rounded portion 308, with a circular orifice 310 facing the place where the axis of the rotor 109 takes place in order to allow the purge the pump before use, as will be described later This orifice can be closed by a cover 311 sliding in a recess 312 in the upper wall of the module
Le plateau 305 comporte également deux canaux 313 et 314 ménagés chacun dans le fond d'un de ses côtés parallèlement à celui-ci. Le canal 313 relie le logement 301 à la partie antérieure du logement 307. Avant de déboucher dans celle-ci, il présente un portion coudée 315, de plus grand diamètre, formée et dimensionnée de manière à recevoir et maintenir par enclipsage le raccord rigide 204 du tuyau souple 202. Le canal 314 part de la partie antérieure du logement 307 à l'opposé de l'endroit où arrive l'autre canal 313 et débouche à l'extérieur après une portion coudée 316, de plus grand diamètre, formée et dimensionnée de manière à recevoir et maintenir par enclipsage le raccord rigide 205 du tuyau 202.The plate 305 also includes two channels 313 and 314 each formed in the bottom of one of its sides parallel to the latter. The channel 313 connects the housing 301 to the front part of the housing 307. Before opening into the latter, it has a bent portion 315, of larger diameter, formed and dimensioned so as to receive and hold by clipping the rigid connector 204 of the flexible pipe 202. The channel 314 starts from the front part of the housing 307 opposite the place where the other channel 313 arrives and opens out after a bent portion 316, of larger diameter, formed and dimensioned so as to receive and hold by clipping the rigid connection 205 of the pipe 202.
On se référera maintenant plus spécialement aux figures 4, 5 et 6 qui montrent la façon dont les trois modules précédemment décrits s'accouplent pour former la pompe miniature selon l'inventionReference will now be made more specifically to FIGS. 4, 5 and 6 which show the way in which the three previously described modules couple to form the miniature pump according to the invention
Le module réservoir 200 est, tout d'abord, mis en place dans le module cassette 300 La poche plastique 201 est introduite dans son logement 301 et le tuyau souple 202 positionné dans les canaux 313 et 314 en veillant à ce que ses deux raccords rigides 204 et 205 prennent place et s'enclipsent respectivement dans les portions coudées 315 et 316 du plateau 305 Après avoir refermé le couvercle 302, il ne reste plus alors qu'à insérer la cassette dans les coulisses 102 du module pompe 100 jusqu'à ce que les languettes 306 s'accrochent dans les ouvertures 103 (figure 5) L'extrémité de la partie inférieure du roter 109 vient occuper le dégagement 309 du plateau 305, tandis que la portion centrale du tuyau souple 202 se trouve automatiquement emprisonnée entre le rotor 109 et la pièce d'appui 308 Lorsque le rotor sera mis en rotation dans le sens de la flèche F (sens inverse des aiguilles d'une montre), les galets 1 10 viendront tour à tour compπmer le tuyau 102 pour pousser vers l'extérieur la solution qu'il contientThe tank module 200 is, first of all, placed in the cassette module 300 The plastic bag 201 is introduced into its housing 301 and the flexible pipe 202 positioned in the channels 313 and 314 while ensuring that its two rigid connections 204 and 205 take place and snap into the bent portions 315 and 316 respectively of the tray 305 After closing the cover 302, all that remains is to insert the cassette behind the scenes 102 of the pump module 100 until the tongues 306 hang in the openings 103 (FIG. 5) The end of the lower part of the roter 109 comes to occupy the clearance 309 of the plate 305, while the central portion of the pipe flexible 202 is automatically trapped between the rotor 109 and the support piece 308 When the rotor is rotated in the direction of the arrow F (anti-clockwise), the rollers 1 10 will come in turn compπmer the hose 102 to push out the solution it contains
La pompe étant ainsi chargée, le bouchon 203 du tuyau est enlevé et remplacé, comme le montre la figure 6, par un tuyau 601 se terminant par une aiguille 602 Avant d'introduire cette dernière dans le patient, il est impératif d'évacuer l'air présent dans le circuit et d'y faire arriver la solution à injecter La vitesse de rotation normale du rotor 109 étant très faible (0 625 tour/minute), ainsi qu'il sera décrit plus loin, cette opération de purge doit, pour ne pas prendre trop de temps, être effectuée en faisant tourner rapidement le rotor par des moyens externes L'extrémité supéπeure de l'axe de ce dernier présente, à cet effet, une ouverture de forme 134 apparaissant dans l'ouverture 310 de la cassette et qui permet, à l'aide d'un outil approprié, la rotation rapide du rotor jusqu'à ce que des gouttes de la solution à injecter sortent de l'aiguille 602 Celle-ci peut être alors introduite dans le patient, après quoi la pompe est mise en marche en appuyant sur le bouton 105 qui commande la mise en rotation du rotor 109 par des moyens qui seront décrits plus loin en détailThe pump being thus loaded, the plug 203 of the pipe is removed and replaced, as shown in FIG. 6, by a pipe 601 ending with a needle 602 Before introducing the latter into the patient, it is imperative to evacuate the air present in the circuit and to bring therein the solution to be injected. The normal rotation speed of the rotor 109 being very low (0 625 rpm), as will be described later, this purging operation must, so as not to take too long, be carried out by rapidly rotating the rotor by external means. The upper end of the axis of the latter has, for this purpose, an opening of shape 134 appearing in the opening 310 of the cassette and which allows, using an appropriate tool, the rapid rotation of the rotor until drops of the solution to be injected exit from the needle 602 This can then be introduced into the patient, after the pump is started by pressing on the button 105 which controls the rotation of the rotor 109 by means which will be described later in detail
En fin de traitement, le désaccouplement des modules pompe 100 et cassette 300 est réalisé en appuyant sur les deux boutons 104 de manière à dégager les languettes 306 des ouvertures 103 La cassette peut alors être extraite en la glissant vers l'extérieur avant d'en retirer le réservoir 200 qui peut être remplacé par un autre, la cassette et la pompe pouvant être réutilisées pour un autre traitementAt the end of treatment, the uncoupling of the pump 100 and cassette 300 modules is carried out by pressing the two buttons 104 so as to release the tabs 306 from the openings 103 The cassette can then be removed by sliding it outwards before being removed. remove the tank 200 which can be replaced by another, the cassette and the pump can be reused for another treatment
Le module pompe 100 va être maintenant déent en se référant aux figures 7 a 1 1 qui montrent le rotor 109, un moteur pas à pas 1 1 1 , un train d'engrenages 1 12 couplant le moteur au rotor, un module électronique de commande 1 13 et une pile bâton 1 14The pump module 100 will now be described with reference to FIGS. 7 a 1 1 which show the rotor 109, a stepping motor 1 1 1, a gear train 1 12 coupling the motor to the rotor, an electronic control module 1 13 and a stick battery 1 14
Le rotor 109, représenté en détail sur les figures 8 et 9, comporte une base circulaire 1 15 munie d'une denture périphérique 1 16 et montée en libre rotation sur un pivot 117 faisant partie du fond du boîtier 101 Une couronne 1 18, de diamètre extérieur légèrement inférieur a celui de ta base 1 15, est montée sur cette dernière et fixée à elle par des tenons 1 19 Cette couronne présente, vers l'intérieur, trois bras souples 120 moulés dans sa masse à 120° l'un de l'autre et formant des cliquets dont l'extrémité coopère avec la péπphéπe en dents de scie 121 d'une roue 122 Celle-ci constitue la base d'un plateau porte-galets cylindπque 123 monté sur l'axe de la base 115 autour duquel il peut tourner librementThe rotor 109, shown in detail in Figures 8 and 9, has a circular base 1 15 provided with peripheral teeth 1 16 and mounted in free rotation on a pivot 117 forming part of the bottom of the housing 101 A crown 1 18, of external diameter slightly smaller than that of your base 1 15, is mounted on the latter and fixed to it by tenons 1 19 This crown has, towards the inside, three flexible arms 120 molded in its mass at 120 ° from one another and forming pawls, the end of which cooperates with the sawtooth path 121 of a wheel 122 This constitutes the basis of a cylindrical roller carrier plate 123 mounted on the axis of the base 115 around which it can rotate freely
La paroi péπphéπque du plateau 123 a un profil incurvé vers l'intéπeur 124 de manière à former un canal pour le passage du tuyau souple 202 Cette même paroi est également percée de trois logements 125 en forme de U disposés à 120° l'un de l'autre pour recevoir les trois galets 1 10 de compression du tuyauThe wall of the plate 123 has a profile curved towards the interior 124 so as to form a channel for the passage of the flexible tube 202 This same wall is also pierced with three U-shaped housings 125 arranged at 120 ° one of the other to receive the three rollers 1 10 for compressing the pipe
Chaque galet 1 10 est formé d'un axe 126 et d'un corps cylindπque 127 monté sur l'axe autour duquel il peut tourner librement Les deux extrémités de cet axe prennent place dans des ouvertures oblongues 128 ménagées radialement dans les portions du plateau 123 formant les parois planes inférieure et supéπeure des logements 125. Les galets sont maintenus en position verticale, c'est à dire avec leur axe parallèle à l'axe du rotor, et soumis à une force radiale dirigée vers l'exténeur grâce à deux ressorts 129 disposés de part et d'autre du plateau 123 Chaque ressort comporte une partie centrale rigide 130, de forme sensiblement tπangulaire, fixée au plateau concentπquement à lui par des rivets 131 et trois bras ressorts flexibles recourbés 132 dont les extrémités libres prennent appui sur les extrémités respectives des axes 126 et les poussent vers l'exténeur de manière à ce que les galets 1 10 exercent sur le tuyau 202 une force sensiblement constante, fixée à 120 grammes dans l'exemple décrit Les erreurs de positionnement relatif des galets et du tuyau, dues aux inévitables défauts de fabrication, sont ainsi automatiquement compensées, ce qui évite une compression excessive ou insuffisante du tuyau 202Each roller 1 10 is formed by an axis 126 and a cylindrical body 127 mounted on the axis around which it can rotate freely The two ends of this axis take place in oblong openings 128 formed radially in the portions of the plate 123 forming the lower and upper planar walls of the housings 125. The rollers are held in a vertical position, that is to say with their axis parallel to the axis of the rotor, and subjected to a radial force directed towards the extender by means of two springs 129 arranged on either side of the plate 123 Each spring has a rigid central part 130, of substantially triangular shape, fixed to the plate concentπment to it by rivets 131 and three flexible bent spring arms 132 whose free ends bear on the respective ends of the axes 126 and push them towards the expander so that the rollers 1 10 exert on the pipe 202 a substantially constant force, fix ée at 120 grams in the example described The relative positioning errors of the rollers and the pipe, due to the inevitable manufacturing defects, are thus automatically compensated, which avoids excessive or insufficient compression of the pipe 202
Le plateau 123 se prolonge axialement vers la haut par une protubérance 133 traversant la partie centrale 130 du ressort supéπeur 129 Cette protubérance est percée de l'ouverture de forme 134 déjà citée dans laquelle peut s'introduire, a travers l'orifice circulaire 310 de la cassette, la pointe profilée de manière correspondante d'un outil (non représenté) permettant la rotation rapide du plateau pour effectuer la purge de la pompe L'entraînement en rotation du rotor 109 est assuré par le moteur pas à pas 111 qui est du type monophasé bipolaire classique et tourne à la vitesse de 16 tours/seconde à raison de deux pas par tour. Son noyau-bobine et son stator, respectivement désignés par les références 135 et 136, sont fixés sur des pieds formés dans le fond du boîtier 101 par deux vis 137 Son rotor 138 pivote entre le fond du boîtier et un pont 139 fixé par des vis 140 sur des pieds solidaires du fond du boîtier.The plate 123 is extended axially upwards by a protuberance 133 passing through the central part 130 of the upper spring 129 This protuberance is pierced with the opening of form 134 already mentioned in which can be introduced, through the circular orifice 310 of the cassette, the correspondingly shaped tip of a tool (not shown) allowing the rapid rotation of the plate to purge the pump The rotor 109 is driven in rotation by the stepping motor 111 which is of the conventional bipolar single-phase type and rotates at the speed of 16 revolutions / second at the rate of two steps per revolution. Its core-coil and its stator, respectively designated by the references 135 and 136, are fixed on feet formed in the bottom of the case 101 by two screws 137 Its rotor 138 pivots between the bottom of the case and a bridge 139 fixed by screws 140 on feet secured to the bottom of the housing.
Le rotor 138 porte un pignon 141 engrenant avec une roue 142 formant le premier mobile du train d'engrenages 112. Le pignon 143 de cette roue engrène lui-même avec une roue 144 dont le pignon 145 engrène enfin avec la denture périphérique 116 de la base 115 du rotor 109 pour la faire tourner à la vitesse de 0.625 tour par minute. Les roues 142 et 144 pivotent, comme le rotor 138, entre le fond du boîtier et le pont 139. Ce dernier se termine, après un coude, par deux bras 146, non représentés sur la figure 9, dont l'extrémité commune comporte une ouverture circulaire dans laquelle est maintenue et pivote la protubérance 133 du rotor 109.The rotor 138 carries a pinion 141 meshing with a wheel 142 forming the first moving part of the gear train 112. The pinion 143 of this wheel itself meshes with a wheel 144 whose pinion 145 finally meshes with the peripheral toothing 116 of the base 115 of rotor 109 to rotate it at the speed of 0.625 revolutions per minute. The wheels 142 and 144 pivot, like the rotor 138, between the bottom of the housing and the bridge 139. The latter ends, after a bend, by two arms 146, not shown in FIG. 9, the common end of which includes a circular opening in which the protuberance 133 of the rotor 109 is held and pivots.
En fonctionnement, lorsque la base 115 du rotor est entraînée dans le sens de la flèche F par le moteur 111 par l'intermédiaire du train d'engrenages 112, elle fait tourner avec elle la couronne 118 dont elle est solidaire Les trois cliquetsIn operation, when the base 115 of the rotor is driven in the direction of the arrow F by the motor 111 via the gear train 112, it rotates with it the crown 118 of which it is integral The three pawls
120 de cette dernière coopèrent alors avec la périphérie en dents de scie 121 de la roue 122 pour la mettre en rotation et, avec elle, le plateau porte-galets 123 dont elle forme la base Les galets 1 10 viennent ainsi tour à tour comprimer le tuyau 102 pour pousser le liquide qu'il contient en direction de l'aiguille d'injection 602120 of the latter then cooperate with the sawtooth periphery 121 of the wheel 122 to set it in rotation and, with it, the roller carrier plate 123 of which it forms the base The rollers 1 10 thus come in turn to compress the pipe 102 for pushing the liquid it contains towards the injection needle 602
Lorsque, pour réaliser la purge des tubulures, on fait tourner le plateau porte- galets 123 à l'aide d'un outil de forme appropriée introduit dans l'ouverture 134, la base 1 15 et la couronne 1 18 deviennent fixes, car freinées par le couple de rétention du moteur 1 1 1 et son train d'engrenages 1 12 Un débrayage s'opère alors automatiquement entre la couronne 1 18 et la roue 122 du fait que la rotation de celle-ci provoque l'expulsion des trois cliquets 120 des dents de scieWhen, in order to purge the pipes, the roller-bearing plate 123 is rotated using a tool of appropriate shape introduced into the opening 134, the base 1 15 and the crown 1 18 become fixed, because they are braked by the retention torque of the motor 1 1 1 and its gear train 1 12 A clutch then operates automatically between the crown 1 18 and the wheel 122 because the rotation of the latter causes the expulsion of the three pawls 120 sawtooth
121 Le plateau porte-galets 123 peut ainsi être tourné rapidement sans effet sur le tram d'engrenages et le moteur121 The roller carrier 123 can thus be rotated quickly without effect on the gears tram and the motor
Le module électronique de commande 113, représenté sur la figure 10, a pour base une plaquette de circuit imprimé 147 fixée sous la face supérieure du boîtier et portant les boutons 105 et 106, l'avertisseur acoustique 107 et l'affichage LCD 108. La plaquette porte également un circuit microprocesseur 148 intégrant les principales fonctions suivantes : doubleur de tension, base de temps à quartz, mémoire, driver LCD et générateur de son. Ce microprocesseur étant d'un type connu, tel que le EPSON 62L35, il ne sera pas décrit en détail. L'ensemble de ces composants ainsi que la pile 114 et la bobine du moteur 111 sont interconnectés selon le schéma simplifié de la figure 11.The electronic control module 113, shown in FIG. 10, is based on a printed circuit board 147 fixed under the upper face of the housing and carrying the buttons 105 and 106, the horn 107 and the LCD display 108. The plate also carries a microprocessor circuit 148 integrating the following main functions: voltage doubler, quartz time base, memory, LCD driver and sound generator. This microprocessor being of a known type, such as the EPSON 62L35, it will not be described in detail. All of these components as well as the battery 114 and the coil of the motor 111 are interconnected according to the simplified diagram of FIG. 11.
Le microprocesseur 148 est programmé, selon des moyens bien connus de l'homme de métier, pour que l'ensemble fonctionne comme suit.The microprocessor 148 is programmed, according to means well known to those skilled in the art, so that the assembly operates as follows.
Lorsque l'interrupteur 105 est actionné pour la première fois, il déclenche le fonctionnement du microprocesseur 148 qui, sous les ordres d'un programme d'administration enregistré dans la mémoire, applique aux bornes du moteur pas à pas 111 des impulsions motrices à la fréquence de 32 Hz provoquant sa rotation à la vitesse de 16 tours/sec. Le rotor porte-galets 109 est alors entraîné à la vitesse de 0.625 tour/min. Le fonctionnement de la pompe est interrompu lorsque l'interrupteur 105 est actionné une deuxième foisWhen the switch 105 is actuated for the first time, it triggers the operation of the microprocessor 148 which, under the orders of an administration program stored in the memory, applies across the stepping motor 111 motor pulses to the 32 Hz frequency causing it to rotate at a speed of 16 rpm. The roller-bearing rotor 109 is then driven at the speed of 0.625 rpm. Pump operation is interrupted when switch 105 is actuated a second time
Pour fixer les idées, avec un rayon de rotation du plateau porte-galets de 10.44 mm et une vitesse de 0.625 tour/min, la solution progresse dans le tuyau à la vitesse de 41 mm/min. En choisissant un tuyau ayant un diamètre intérieur de 1.47 mm, le débit instantané de la pompe est ainsi de 69.54 mm3/mιn, soit 100 cm3/jour.To fix the ideas, with a radius of rotation of the roller-bearing plate of 10.44 mm and a speed of 0.625 rpm, the solution advances in the pipe at the speed of 41 mm / min. By choosing a hose with an internal diameter of 1.47 mm, the instantaneous flow rate of the pump is thus 69.54 mm3 / min, or 100 cm3 / day.
Le microprocesseur 148 permet également, en réponse à l'actionnement du bouton 106, d'échapper au programme d'administration mis en mémoire pour commander l'injection d'une quantité supplémentaire déterminée de solution (bolus). Cette procédure est plus particulièrement destinée aux traitements anti- douleur.The microprocessor 148 also makes it possible, in response to the actuation of the button 106, to escape the administration program stored in memory to order the injection of a determined additional quantity of solution (bolus). This procedure is more particularly intended for pain relief treatments.
La pompe est également munie de moyens permettant d'actionner l'avertisseur acoustique 107 et/ou l'affichage LCD 108 en cas de mauvais fonctionnement non respect du programme, arrêt, obstruction de l'aiguille, fin de vie de la pile ... Ces moyens ne faisant pas l'objet du présent brevet, ils ne seront pas décrits. On se référera enfin à la figure 12 qui montre une variante de réalisation du module cassette 300 pour des traitements nécessitant l'injection d'importantes quantités de solution. La cassette peu, certes, être rallongée pour recevoir un réservoir plus grand, mais si le volume de celui-ci dépasse 20 ml, l'encombrement de la pompe risque de la rendre peu pratique Pour cette raison, le module cassette de la figure 12 ne comporte que le plateau 305 décrit à la figure 3, les mêmes références étant utilisées pour désigner les mêmes éléments. Le module réservoir comprend alors une poche de grand volume 206, qui n'est pas introduite dans de la cassette mais seulement reliée à elle par un tuyau souple 202 plus long identique à celui décrit à la figure 2. The pump is also provided with means making it possible to actuate the audible alarm 107 and / or the LCD display 108 in the event of a malfunction not respecting the program, stopping, obstruction of the needle, end of life of the battery. These means not being the subject of this patent, they will not be described. Finally, reference is made to FIG. 12 which shows an alternative embodiment of the cassette module 300 for treatments requiring the injection of large quantities of solution. The cassette can, of course, be extended to receive a larger tank, but if the volume of this exceeds 20 ml, the size of the pump may make it impractical For this reason, the cassette module in Figure 12 only comprises the plate 305 described in FIG. 3, the same references being used to designate the same elements. The reservoir module then comprises a large-volume pocket 206, which is not introduced into the cassette but only connected to it by a flexible hose 202 longer identical to that described in FIG. 2.

Claims

REVENDICATIONS
1 Pompe péπstaltique miniature comportant1 miniature pump containing
- un rotor (109) équipé d'au moins deux galets tournants (110), - des moyens d'entraînement (111 112) dudit rotor,- a rotor (109) equipped with at least two rotating rollers (110), - drive means (111 112) of said rotor,
- des moyens de commande (113) desdits moyens d'entraînement,- control means (113) of said drive means,
- une pièce d'appui munie d'une portion arrondie (308) disposée de manière sensiblement concentrique audit rotor et contre laquelle, en fonctionnement, lesdits galets viennent comprimer un tuyau souple (202) relié à un réservoir de solution (201 ) pour pousser celle-ci vers l'exténeur et- A support piece provided with a rounded portion (308) disposed in a manner substantially concentric with said rotor and against which, in operation, said rollers compress a flexible pipe (202) connected to a solution tank (201) for pushing this towards the exterior and
- des moyens de compensation automatique des écarts de position entre les galets et ladite pièce d'appui, ladite pompe étant caractérisée en ce que chaque galet (110) comporte un corps (127) sensiblement cylindπque et un axe (126) sur lequel ledit corps est monte rotatif, en ce que les extrémités des axes des galets prennent place dans des ouvertures oblongues (128) ménagées radialement dans le rotor et en ce que lesdits moyens de compensation comportent deux ressorts (129) disposes au niveau des extrémités respectives desdits axes et comprenant une partie centrale (130) concentrique au rotor et deux bras ressorts (132) recourbes, un pour chaque galet, dont une extrémité est reliée à ladite partie centrale et dont l'autre extrémité prend appui sur l'extrémité correspondante d'un axe de galet pour le pousser vers l'exténeur et lui permettre ainsi d'exercer sur le tuyau une force de compression sensiblement constante- means for automatically compensating for position differences between the rollers and said support piece, said pump being characterized in that each roller (110) comprises a body (127) substantially cylindπque and an axis (126) on which said body is rotatably mounted, in that the ends of the axes of the rollers take place in oblong openings (128) formed radially in the rotor and in that said compensation means comprise two springs (129) arranged at the respective ends of said axes and comprising a central part (130) concentric with the rotor and two curved spring arms (132), one for each roller, one end of which is connected to said central part and the other end of which bears on the corresponding end of an axis roller to push it towards the exterior and thus allow it to exert on the pipe a substantially constant compressive force
2 Pompe péπstaltique miniature selon la revendication 1 , caractérisée en ce que2 miniature pump according to claim 1, characterized in that
- le rotor et ses galets, lesdits moyens d'entraînement et lesdits moyens de commande forment un premier module (100), dit module pompe,the rotor and its rollers, said drive means and said control means form a first module (100), said pump module,
- la pièce d'appui fait partie d'un deuxième module (300), dit module cassette,the support piece is part of a second module (300), called the cassette module,
- lesdits modules sont dotés chacun de moyens permettant leur accouplement et- said modules are each provided with means allowing their coupling and
- le module cassette comporte des moyens pour recevoir de manière interchangeable le tuyau (202) qui fait partie indissociable du réservoir (201) et positionner automatiquement ledit tuyau de manière à ce qu'au moment de l'accouplement des deux modules il s'applique contre ladite portion arrondie (308) pour y être comprimé par lesdit galets, le tuyau et le réservoir formant ainsi un troisième module (200), dit module réservoir, qui peut être aisément échangé avec un autre après usage 3 Pompe péπstaltique miniature selon la revendication 2, caractérisée en ce que le module cassette (300) comprend un plateau (305) s'engageant, comme un tiroir, dans le module pompe et percé d'un logement (307), en forme générale de U, profilé et dimensionné pour entourer le rotor et dont le fond arrondi (308) constitue la pièce d'appui du tuyau et en ce que les moyens pour recevoir et positionner ledit tuyau comportent un premier (313) et un deuxième canal (314) ménagés le long des côtés respectifs dudit plateau, lesdits canaux ayant une extrémité ouverte sur l'extérieur du plateau et leurs autres extrémités débouchant à l'opposé l'une de l'autre dans l'entrée dudit logement- The cassette module includes means for interchangeably receiving the pipe (202) which is inseparable from the tank (201) and automatically positioning said pipe so that when the two modules are coupled it is applied against said rounded portion (308) to be compressed by said rollers, the pipe and the reservoir thus forming a third module (200), called reservoir module, which can be easily exchanged with another after use 3 miniature peπstaltic pump according to claim 2, characterized in that the cassette module (300) comprises a plate (305) engaging, like a drawer, in the pump module and pierced with a housing (307), in general form of U, profiled and dimensioned to surround the rotor and whose rounded bottom (308) constitutes the support piece of the pipe and in that the means for receiving and positioning said pipe comprise a first (313) and a second channel (314 ) formed along the respective sides of said tray, said channels having one end open on the outside of the tray and their other ends opening opposite one another in the entrance of said housing
4 Pompe péπstaltique miniature selon la revendication 3, caractéπsée en ce que lesdits canaux comportent des moyens pour retenir ledit tuyau par encfipsage4 miniature pump according to claim 3, characterized in that said channels include means for retaining said pipe by encipulation
5 Pompe péπstaltique miniature selon la revendication 4 caractérisée en ce que lesdits moyens pour retenir le tuyau sont constitués par des portions coudées (315, 316) desdits canaux, profilées et dimensionnees pour que des portions (204, 205) de forme correspondante dudit tuyau y prennent place et y soient retenues par enclipsage5 miniature peπstaltic pump according to claim 4 characterized in that said means for retaining the pipe consist of bent portions (315, 316) of said channels, shaped and dimensioned so that portions (204, 205) of corresponding shape of said pipe y take place and are retained by clipping
6 Pompe péπstaltique miniature selon l'une des revendications 2 a 5, caractérisée en ce que le module cassette se fixe dans le module pompe par enclipsage de son plateau dans des coulisses (102) dudit module pompe6 miniature peπstaltic pump according to one of claims 2 to 5, characterized in that the cassette module is fixed in the pump module by clipping its plate in slides (102) of said pump module
7 Pompe peπstaltique miniature selon l'une des revendications 2 a 6 caractérisée en ce que le module cassette comprend, en outre, un logement (301 ) pour recevoir le réservoir de solution7 miniature peπstaltic pump according to one of claims 2 to 6 characterized in that the cassette module further comprises a housing (301) for receiving the solution tank
8 Pompe péπstaltique miniature selon l'une des revendications précédentes, caractérisée en ce qu'elle comporte, en outre, des moyens pour faire tourner ledit rotor par une action externe afin de réaliser la purge du tuyau8 miniature peπstaltic pump according to one of the preceding claims, characterized in that it further comprises means for rotating said rotor by an external action in order to purge the pipe
9 Pompe péπstaltique miniature selon la revendication 8, caractérisée en ce que le rotor est réalise en deux parties concentriques superposées dont la première est couplée auxdits moyens d'entraînement et dont la deuxième porte le galet et en ce qu'il comporte, en outre, des moyens d'embrayage-debrayage grâce auxquels9 miniature pump according to claim 8, characterized in that the rotor is produced in two superimposed concentric parts, the first of which is coupled to said drive means and the second of which carries the roller and in that it further comprises, clutch-clutch means by which
\4 - en fonctionnement normal, ses deux parties coopèrent pour réaliser sa mise en rotation par ses moyens d'entraînement,\ 4 - in normal operation, its two parts cooperate to achieve its rotation by its drive means,
-lorsqu'il est mis en rotation par une action externe, lesdites parties sont automatiquement désaccouplées-when it is rotated by an external action, said parts are automatically uncoupled
10 Pompe péπstaltique miniature selon la revendication 9, caractéπsée en ce que la première partie du rotor comporte une roue dentée (115) coopérant avec lesdits moyens d'entraînement, en ce que sa deuxième partie comporte également une roue dentée (122) formant la base d'un plateau porte-galets (123) et en ce que lesdits moyens d'embrayage-débrayage comportent une couronne (118) fixée sur la roue dentée (115) de la première partie concentπquement à elle, entourant la roue dentée (122) de la deuxième partie et présentant, vers l'intéπeur, au moins un bras souple (120) formant cliquet et dont l'extrémité coopère avec la roue dentée de la deuxième partie10 miniature peπstaltic pump according to claim 9, caractéπsée in that the first part of the rotor comprises a toothed wheel (115) cooperating with said drive means, in that its second part also comprises a toothed wheel (122) forming the base of a roller-bearing plate (123) and in that said clutch-disengaging means comprise a crown (118) fixed on the toothed wheel (115) of the first part concentrically thereto, surrounding the toothed wheel (122) of the second part and having, towards the interior, at least one flexible arm (120) forming a pawl and the end of which cooperates with the toothed wheel of the second part
11 Pompe péπstaltique miniature selon l'une des revendications 8 a 10, caractérisée en ce que les moyens pour faire tourner le rotor par une action externe comportent une protubérance (133) prolongeant l'axe du rotor et percée d'une ouverture de forme (134) destinée à recevoir l'extrémité d'un outil de forme correspondante11 miniature pump according to one of claims 8 to 10, characterized in that the means for turning the rotor by an external action include a protuberance (133) extending the axis of the rotor and pierced with a shape opening ( 134) intended to receive the end of a tool of corresponding shape
I 5 I 5
PCT/CH1997/000329 1996-09-10 1997-09-08 Miniature peristaltic pump WO1998011350A1 (en)

Priority Applications (3)

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DE69709665T DE69709665T2 (en) 1996-09-10 1997-09-08 PERISTALTIC MINIATURE PUMP
EP97937397A EP0927307B1 (en) 1996-09-10 1997-09-08 Miniature peristaltic pump
US09/254,580 US6203296B1 (en) 1996-09-10 1997-09-08 Miniature peristaltic pump

Applications Claiming Priority (2)

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FR96/11171 1996-09-10
FR9611171A FR2753236B1 (en) 1996-09-10 1996-09-10 MINIATURE PERISTALTIC PUMP

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WO1998011350A1 true WO1998011350A1 (en) 1998-03-19

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EP (1) EP0927307B1 (en)
DE (1) DE69709665T2 (en)
ES (1) ES2171269T3 (en)
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WO (1) WO1998011350A1 (en)

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EP0927307B1 (en) 2002-01-09
DE69709665D1 (en) 2002-02-21
FR2753236A1 (en) 1998-03-13
US6203296B1 (en) 2001-03-20
DE69709665T2 (en) 2002-08-22
FR2753236B1 (en) 1998-12-04
EP0927307A1 (en) 1999-07-07
ES2171269T3 (en) 2002-09-01

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